Study Guides & References


The program provides resources to achieve an understanding in areas for each classification that an operator or those desiring to be operators must possess to be prepared for the duties and challenges they will face as an operator.

For more information, select a classification from the options below.

Certification Exam Resources



The following are approved as reference sources for WPI’s standardized wastewater collection operator examinations. For more details, review individual Need-to-Know documents for each examination.

Exam References

Operators should use the latest edition of these reference sources to prepare for the exam.


Certification Exam Resources



The following are approved as reference sources for WPI’s standardized water distribution operator examinations. For more details, review individual Need-to-Know documents for each examination.

Exam References

Operators should use the latest edition of these reference sources to prepare for the exam.


Certification Exam Resources



Biological/Natural System Operator


The following are approved as reference sources for WPI’s standardized wastewater treatment operator examinations Grades I - IV. For more details, review individual Need-to-Know documents for each examination.

Exam References 

Operators should use the latest edition of these reference sources to prepare for the exam.


Certification Exam Resources



The following are approved as reference sources for WPI’s standardized water treatment operator examinations. For more details, review individual Need-to-Know documents for each examination.

Exam References 

References for Small Water Systems are listed in the final pages of the Need-to-Know document

Operators should use the latest edition of these reference sources to prepare for the exam.


TN Operator Certification Formula Manual Series

Four official references developed for Tennessee water and wastewater operators

Pilot Period Notice: During the Fall 2025 pilot, operators will be provided the new Tennessee Operator Certification Formula Manual for their classification and the legacy FTC and ABC references. After the pilot, only the Tennessee Operator Certification Formula Manuals will remain approved.

Contact Information

General Contact | Fleming Training Center
(615) 898-8090
Fleming.Training@tn.gov
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Location Information

Fleming Training Center
2022 Blanton Dr.
Murfreesboro, TN 37129

Monday - Friday
8:00 AM - 4:30 PM CST